| 초록 |
With the advent of foldable devices, flexible protective coating is indispensable to keep the device from failure. To obtain the reliable protective coating, sufficiently hard, but coating material having high elongation property is required. However, both characteristics in polymeric materials are mutually exclusive. In this study, we developed unique material for surface protective coating by tethering elastic PDMS to a rigid epoxy-siloxane network. PDMS-tethered epoxy-siloxane hybrid (P-t-ESH) material was fabricated by in situ sol-gel reaction between PDMS and epoxy-functionalized silane precursor. The flexible backbone in PDMS enhanced the strain at fracture, while tensile strength also improved through chemical crosslinking between PDMS and epoxy-siloxane network. As a result, P-t-ESH endured under repetitive folding test (bending radius: 5mm, for 100,000 cycles). Moreover, due to the hydrophobic nature of PDMS, P-t-ESH also endured an abrasion test. |
